Mike,
Chris Prim (cp914@lvcm.com) make a power window kit that uses high quality german motors and supplies the hardware to fit a 914. My car's undergoing a six conversion at aircooled racing. You can see it here:
Steve at aircooled said it went in, no fuss, no muss. Chris has a website:
914turbo. I'd love a set of his twin beam projector conversion kits, and put HIDs in the low beams, but he says they aren't ready for production yet...